simh & tape images

I've been working (well, ok, playing :) on my PDP11/83 system recently. I acquired some more ESDI drives (many thanks to John Honniball) & I have done a successful copy (BRU DU0: DU1:) of my ailing Fujitsu M2246E RSX11M+ v4.1 system onto a Micropolis 1558 (from a sun shoebox) with the drives hung off an Emulex QD21 card. Having got a M7546 & TK50 drive finally working, then re-SYSGENing RSX11M+ to support the MU: device, I now at last have a tape backup on a couple of TK50s (BRU DU0: MU0:) I've also transferred these as a couple of big files to a PC, thanks to the ST program from dbit.com & using the TK50 drive on a TZK50 SCSI-TK50 adaptor. Now, how do I use these on the SimH PDP11 emulator! ? (also anyone know the procedure to generate stand alone backup [BRU] on a TK50 under RSX11M-PLUS?) greg